Blade for road scrapers



Sept. 27, 1932. c. H. BROWN ET AL BLADE FOR ROAD SCRAPERS Filed March 6,1931 Wit ATTORNEY Patented Sept. 27, 1932 usurp stares PAT...

r a CHARLES HENRY BROWN AND PATRICK BRAZIER, OF BRECKENRIDGE, TEXAS fBLADE non nonnsonarnns Application filed March 6,

placed on the shank which holdsthe blade.

vAnother object is to so construct the cutter blade support to providefor the throwing of the top of the mold board to handle wet earth and toposition the cutting blade at a proper angle in regard to the soil. Theblade is designed to be so set that the dirt assumes a rolling motionand is thrown forward and towards the dump. r

. Another object is to so mount the blade as to provide for the changein the slant thereof with relation to the direction of motion and alsoto operate as a brace for the ends of the blade.

In carrying out these objects, the invention is susceptible of a widerange of modification without departing from the spirit or sacrific ingany of the advantages of the claimed invention; there being shown in thedrawing for illustrative purposes a preferred and practical form, inwhich: V v

Figure 1 represents a perspective view of a grader equipped with thisimproved blade;

Fig. 2 is a perspective vview taken from the front showing the blade andits mounting Fig. 3 is a transverse section taken through the blade andits support; and I Fig. 1 is a detail perspective view of a pore tionofits blade and its mounting taken from the rear. V

In the embodiment illustrated the blade structure constituting thisinvention comprises a mold board 10 which supports the reversiblecutting blade 20 which latter is bolted on the lower portion of thetransversely curved mold board 10, the concave face of which extendsforwardly and has its lower edge ofiset rearwardly to form a seat 11 toreceive the cutter 20. The upper portion of the mold board 10 is ofarc-shaped form and the cutter 20 has a difierent radius from the upperportion of the mold board so that the top of the mold board may bethrown for- 1931 Serial no. 1 520,664.

wardly a proper distance to handle very wet earth and yet provide theproper cutting angle for the blade 20. This adjustment of the blade-isaccomplished through means of a segment 15-v and its connection witha'member 16 of a swivelled post 17. This swivelled post 17 is mounted inthe'upright socket member of a four-way casting or coupling 6 constituting apart of'the grader frame. This post is suitably secured tothe casting by any means a collar 18 resting on the upper end of thecasting 6 and which has a pin 19 extending therethrough to hold the postin position.

The blade engaging portionof this post 17 shown at 16 is madefiat and ispivotally connected at its lower end as shown at 16a to the v segment 15carried by the rear face of the mold board 10 which supports the cuttingblade 20.

This blade or mold board carrying-segment '15 is provided at its upperend with a plurality of transversely spaced apertures 21 to receive abolt 22' which adjustably connects the mold board with the post. Theblade carrying mold board 10 whic is swivelled by the post 17 and thecenter casting 6 may be of any suitable or desired length and isequipped with longitudinally spaced bearings 23 on its rear face inwhich is mounted the rod 21on which the swivelled post is pivoted. Thisrod also forms a pintle for the segmental adjusting plate 25 for theswivelled mold board 10. This plate 25 is shown substantiallysemi-circular with bearings 26 at its ends engaged with the pintle 24adjacent the bearings 23 as is shown clearly in Fig. 1. This plate 25 isprovided with a plurality of spaced apertures 27 eX- tending verticallytherethrough and which are designed to receive a locking pin 28 mountedto reciprocate vertically in a casting 'Z'depending from the frame'member5.

said casting being provided with laterally and forwardly extendingapertured arms to form supports for the pin. A coiled spring 29surrounds the pin between two of the bearings and bears at one endagainst the upper bearing and at its lower end against another.

A suitable lever operable from the drivers seat is provided formanipulating'the pin 28 and retracting it against the tension of thespring 29 to provide for the lateral adjustment of plate 25 whichcarries the mold board.

'Mounted on the segmental plate 25 near the opposite ends thereof are'two upstanding stops 30 here shown in the form of bolts which aredesigned to engage the casting when the tongue or draft bar 8 is swunglaterally in one direction or the other so that the swivelling of themold board may be accomplished by this means without necessitatingmanual manipulation thereof. These stops 3-0 will hold the blade whenthe machine has been swivelled to a. predetermined position so that allthat is'required of the driver is to release the locking pin 28 andthe'blade will return to its placewithout further effort.

It is of course understood that. these bolts 30 which form stops areadjustable and are previously set at the predetermined position that theblade is desired to be swivelled and will save much time and annoyanceto the operator when adjusting the cutting blade.

Owing to the transverse curvature of the mold board 10 with the topthereof setting far forward in what might be termed overhung positionthis board will not load up and fall to the ground as does theordinarygrader blade, because when it gets as much dirt in front of it as it canhandle, the cutting.

edge of the blade 20 is raised from the ground. It simply has notendency to overload. The mold board and blade rolls the earth and wetdirt over and over in front of the blade and the dirt falling each timefrom its contact with the mold board actually.

ascribes a spiral whose pitch is as the angularity of and rise of theblade. 7

The machine is equipped with ground wheels 40 and 41 which arepreferably con structed as shown of sheet metal having sharp thinvertical edges to hold the machine on slanted banks and which operatewhen the dirt is soft enough to stick to roll it off of the wheel.

In use the draft means being hitched to the clevis or hitch member 45andthe blade carrying mold board 10 is swivelled until one end sets infront of the other generally at an angle of aboutfifty to sixty degrees.The forward end of the blade as shown in Fig. 1 is lowered into theearth by throwing the lever which controls one of the groundtion. Themold board is then pitched forcutting blade 20 at a proper angle inregard to the soils The adjustment of the depth of the cutter on oneside and height of delivery on the opposite side of the machine canreadily be made by means of segment racks 31 and 32 and their levers 33and 34 having the usual locking latches or dogs.

It will be obvious that the swivelling segment or plate 25 not onlyprovides for change in the slant .of the blade with relationv tothedirection of motion, but also operates as a brace for the ends of theblade.

Without further description it is thought that thefeatures andadvantages of the invention will be readily apparent to those skilled inthe art-and it will, of course, be understoodthat changes in the form,proportion and minor details of construction may.

be resorted to, without departing from the spirit of the invention orits scope as claimed.

We claim:

In a grading machine, a supporting structure, a cutting blade includinga mold board arcuate intransverse crosssection with its loweredge'olfset rearwardly to form a seat for a cutting blade, and a cuttingblade also arcuate in transverse cross section and of smaller radius ofcurvature than the mold board disposed in said offset portion, thecutting blade being sheared off at an angle along its opposite edges toprovide cutting edges of similar formation so'that the blade may bereversed, the offset portion being of substantially the same width asthe blade, the offset portion forming with the mold board an inclinedshoulder to neatly receive the sheared off cutting edge of the blade.

CHARLES HENRY BROWN. PATRICK FRAZIER.

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